: My GE Spacemaker Microwave oven suddenly quit.
: It runs and sounds normal, but it does not
: heat.

: Is there a fuse inside that might have blown?

Usually if the internal fuse had blown, the microwave part would stop working all together.

The problem could be in a number of different areas but one of the circuit boards might be the cause. Check your warranty papers to see if they might still be covered. The Magnetron tube should be if that is the cause and if under 5 years old.

: My GE Spacemaker Microwave oven suddenly quit.
: It runs and sounds normal, but it does not heat.

: One day it was working fine and the next
: day...nothing??

Sorry, this same thing happened to me a few months ago with my 4 year old Spacemaker. It was the magnatron? - the part that generates the heat and makes it a microwave. This part is under warranty, but GOOD LUCK trying to get someone (GE) to come out in a timely manner. Besides, the PART is covered under the warranty, but NOT the LABOR ($200 and up)! I found a local appliance repairman who did the work (including the part) for $200. Hope this helps.